WARNING: Video contains disturbing images. Discretion is advised.

Russian President Vladimir Putin said on Saturday that all those responsible for the deadly mass shooting on a concert near Moscow would be punished.

"We will identify and punish everyone who stood behind the terrorists, who prepared this attack against Russia, against our people," he said.

Putin, addressing the nation, claimed that attackers had sought to escape towards Ukraine, but all four were detained.

He added that 11 people in total were detained.

Russia's state Investigative Committee said 133 people had been killed. ISIS claimed responsibility for the attack, which state officials are investigating as terrorism.

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